Isobutane is a propellant used to dispense a product from a container. It is often used in concert with other propellants such as butane and propane. While isobutane is commonly known for its use as a fuel, for example for camp stoves, in use as a propellant its energy comes from being compressed in a can rather than from being lit or heated. Isobutane is one of the hydrocarbon propellants we used to replace the chlorofluorocarbons (CFCs) that were previously used in aerosol products and which were ultimately shown to be damaging to the ozone layer. SC Johnson eliminated the uses of CFCs back in 1975, three years before the government required companies to do so.